On today's show, you'll hear about a paper delivered on a chilly December evening in 1857 by Philip Sclater that hugely inspired Alfred Wallace and eventually led to the publication of the Origin of Species by Charles Darwin.

Both Sclater and Wallace were extraordinary in their own right. Both were passionate about natural history, keen observers of our natural world, world travellers and gracious in their gifts to the world.

Season Ten, Episode 106